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1. (WO2014195410) SCREW DRIVE

Pub. No.:    WO/2014/195410    International Application No.:    PCT/EP2014/061713
Publication Date: Fri Dec 12 00:59:59 CET 2014 International Filing Date: Fri Jun 06 01:59:59 CEST 2014
IPC: B25B 15/00
Applicants: EJOT GMBH & CO. KG
Inventors: LANDSMANN, Nils
The invention relates to a screw (10) with a screw head having a drive (12), wherein the drive (12) comprises cams (14a, 14b, 14c) formed by recesses introduced into the screw head around the cams (14a, 14b, 14c), wherein each cam has two side faces (18a, 18b), which are used for transmitting rotational motion, and an end face (16a, 16b, 16c) connecting the side faces (18a, 18b), the end face (16a, 16b, 16c) having a concave surface contour on the end of the screw head facing away from the screw shank. The invention is characterized in that the end face (16a, 16b, 16c) is designed such that a virtual circular periphery (20a, 20b) around the screw axis in a plane orthogonal to the screw axis and having a radius associated with the plane has a point of contact (22a, 22b, 22c) on the cam with the end face (16a, 16b, 16c). Over at least one portion of the axial height of the end face (16a, 16b, 16c) – the contact region – a plurality of such points of contact (22a, 22b, 22c) are formed, said points of contact (22a, 22b, 22c) forming a contact line (24a, 24b, 24c) in the centre of the end face (16a, 16b, 16c).